From 9df5ff6abc6e95c766d1907c5a9fee00730e749a Mon Sep 17 00:00:00 2001
From: Eduardo Julian
Date: Wed, 30 Mar 2022 15:25:06 -0400
Subject: Re-named ffi.as to "is", and ffi.check to "as", to line the names up
 with normal type-annotation macros.

---
 stdlib/source/library/lux/debug.lux                |   6 +-
 stdlib/source/library/lux/ffi.jvm.lux              | 350 ++++++++++-----------
 stdlib/source/library/lux/ffi.old.lux              | 220 ++++++-------
 .../source/library/lux/target/jvm/reflection.lux   |  22 +-
 stdlib/source/test/lux/ffi.jvm.lux                 |  16 +-
 stdlib/source/test/lux/ffi.old.lux                 |  10 +-
 6 files changed, 312 insertions(+), 312 deletions(-)

(limited to 'stdlib/source')

diff --git a/stdlib/source/library/lux/debug.lux b/stdlib/source/library/lux/debug.lux
index ddc343061..14399ccad 100644
--- a/stdlib/source/library/lux/debug.lux
+++ b/stdlib/source/library/lux/debug.lux
@@ -147,7 +147,7 @@
   Inspector
   (with_expansions [<jvm> (let [object (as java/lang/Object value)]
                             (`` (<| (~~ (template [<class> <processing>]
-                                          [(case (ffi.check <class> object)
+                                          [(case (ffi.as <class> object)
                                              {.#Some value}
                                              (`` (|> value (~~ (template.spliced <processing>))))
                                              
@@ -158,12 +158,12 @@
                                           [java/lang/Number [java/lang/Number::doubleValue ffi.of_double %.frac]]
                                           [java/lang/String [ffi.of_string %.text]]
                                           ))
-                                    (case (ffi.check [java/lang/Object] object)
+                                    (case (ffi.as [java/lang/Object] object)
                                       {.#Some value}
                                       (let [value (as (array.Array java/lang/Object) value)]
                                         (case (array.read! 0 value)
                                           (^.multi {.#Some tag}
-                                                   [(ffi.check java/lang/Integer tag)
+                                                   [(ffi.as java/lang/Integer tag)
                                                     {.#Some tag}]
                                                    [[(array.read! 1 value) (array.read! 2 value)]
                                                     [last? {.#Some choice}]])
diff --git a/stdlib/source/library/lux/ffi.jvm.lux b/stdlib/source/library/lux/ffi.jvm.lux
index 6b0c04c63..5b5e96a9c 100644
--- a/stdlib/source/library/lux/ffi.jvm.lux
+++ b/stdlib/source/library/lux/ffi.jvm.lux
@@ -1,6 +1,6 @@
 (.using
  [library
-  [lux {"-" Primitive Type type int char as}
+  [lux {"-" Primitive Type type int char is as}
    ["[0]" meta]
    [abstract
     ["[0]" monad {"+" do}]]
@@ -115,9 +115,9 @@
      (-> (Type Value) Text Code Code)
      (let [unboxed (..reflection unboxed)]
        (` (|> (~ raw)
-              (is (.Primitive (~ (code.text <pre>))))
+              (.is (.Primitive (~ (code.text <pre>))))
               "jvm object cast"
-              (is (.Primitive (~ (code.text <post>))))))))]
+              (.is (.Primitive (~ (code.text <post>))))))))]
 
   [unbox boxed unboxed]
   [box unboxed boxed]
@@ -126,11 +126,11 @@
 (template [<name> <op> <from> <to>]
   [(template: .public (<name> value)
      [(|> value
-          (is <from>)
+          (.is <from>)
           "jvm object cast"
           <op>
           "jvm object cast"
-          (is <to>))])]
+          (.is <to>))])]
 
   [byte_to_long    "jvm conversion byte-to-long"    ..Byte      ..Long]
 
@@ -424,8 +424,8 @@
   (-> Text Text Text (Parser Code))
   (do <>.monad
     [.let [dotted_name (format "::" field_name)]
-     [_ _ value] (is (Parser [Any Any Code])
-                     (<code>.form ($_ <>.and (<code>.this (' :=)) (<code>.this (code.symbol ["" dotted_name])) <code>.any)))]
+     [_ _ value] (.is (Parser [Any Any Code])
+                      (<code>.form ($_ <>.and (<code>.this (' :=)) (<code>.this (code.symbol ["" dotted_name])) <code>.any)))]
     (in (`' ("jvm member put virtual"
              (~ (code.text class_name))
              (~ (code.text field_name))
@@ -472,9 +472,9 @@
 (def: (constructor_parser class_name arguments)
   (-> Text (List Argument) (Parser Code))
   (do <>.monad
-    [args (is (Parser (List Code))
-              (<code>.form (<>.after (<code>.this (' ::new!))
-                                     (<code>.tuple (<>.exactly (list.size arguments) <code>.any)))))]
+    [args (.is (Parser (List Code))
+               (<code>.form (<>.after (<code>.this (' ::new!))
+                                      (<code>.tuple (<>.exactly (list.size arguments) <code>.any)))))]
     (in (` ("jvm member invoke constructor" (~ (code.text class_name))
             (~+ (|> args
                     (list.zipped/2 (list#each product.right arguments))
@@ -484,9 +484,9 @@
   (-> Text Text (List Argument) (Parser Code))
   (do <>.monad
     [.let [dotted_name (format "::" method_name "!")]
-     args (is (Parser (List Code))
-              (<code>.form (<>.after (<code>.this (code.symbol ["" dotted_name]))
-                                     (<code>.tuple (<>.exactly (list.size arguments) <code>.any)))))]
+     args (.is (Parser (List Code))
+               (<code>.form (<>.after (<code>.this (code.symbol ["" dotted_name]))
+                                      (<code>.tuple (<>.exactly (list.size arguments) <code>.any)))))]
     (in (` ("jvm member invoke static" (~ (code.text class_name)) (~ (code.text method_name))
             (~+ (|> args
                     (list.zipped/2 (list#each product.right arguments))
@@ -497,9 +497,9 @@
      (-> (List (Type Var)) Text (List (Type Var)) Text (List Argument) Text (Parser Code))
      (do <>.monad
        [.let [dotted_name (format "::" method_name "!")]
-        args (is (Parser (List Code))
-                 (<code>.form (<>.after (<code>.this (code.symbol ["" dotted_name]))
-                                        (<code>.tuple (<>.exactly (list.size arguments) <code>.any)))))]
+        args (.is (Parser (List Code))
+                  (<code>.form (<>.after (<code>.this (code.symbol ["" dotted_name]))
+                                         (<code>.tuple (<>.exactly (list.size arguments) <code>.any)))))]
        (in (` (<jvm_op> [(~+ (list#each (|>> ..signature code.text) class_vars))]
                         (~ (code.text class_name)) (~ (code.text method_name))
                         [(~+ (list#each (|>> ..signature code.text) type_vars))]
@@ -582,10 +582,10 @@
       (-> (List (Type Var)) (Parser (Type Class))))
   (do <>.monad
     [.let [class_name^ (..valid_class_name type_vars)]
-     [name parameters] (is (Parser [External (List (Type Parameter))])
-                           ($_ <>.either
-                               (<>.and class_name^ (<>#in (list)))
-                               (<code>.form (<>.and class_name^ (<>.some (parameter^ type_vars))))))]
+     [name parameters] (.is (Parser [External (List (Type Parameter))])
+                            ($_ <>.either
+                                (<>.and class_name^ (<>#in (list)))
+                                (<code>.form (<>.and class_name^ (<>.some (parameter^ type_vars))))))]
     (in (jvm.class (name.safe name) parameters))))
 
 (exception: .public (unknown_type_variable [name Text
@@ -691,12 +691,12 @@
 (def: declaration^
   (Parser (Type Declaration))
   (do <>.monad
-    [[name variables] (is (Parser [External (List (Type Var))])
-                          (<>.either (<>.and (..valid_class_name (list))
-                                             (<>#in (list)))
-                                     (<code>.form (<>.and (..valid_class_name (list))
-                                                          (<>.some var^)))
-                                     ))]
+    [[name variables] (.is (Parser [External (List (Type Var))])
+                           (<>.either (<>.and (..valid_class_name (list))
+                                              (<>#in (list)))
+                                      (<code>.form (<>.and (..valid_class_name (list))
+                                                           (<>.some var^)))
+                                      ))]
     (in (jvm.declaration name variables))))
 
 (def: (class^ type_vars)
@@ -964,9 +964,9 @@
                                             []]})
                      ))
       (<code>.form (do <>.monad
-                     [kind (is (Parser ImportMethodKind)
-                               (<>.or (<code>.this (' "static"))
-                                      (in [])))
+                     [kind (.is (Parser ImportMethodKind)
+                                (<>.or (<code>.this (' "static"))
+                                       (in [])))
                       tvars (<>.else (list) ..vars^)
                       name <code>.local
                       ?alias import_member_alias^
@@ -1209,10 +1209,10 @@
                           methods (<>.some (..method_def^ class_vars))])
   (do meta.monad
     [.let [fully_qualified_class_name full_class_name
-           method_parser (is (Parser Code)
-                             (|> methods
-                                 (list#each (method->parser class_vars fully_qualified_class_name))
-                                 (list#mix <>.either (<>.failure ""))))]]
+           method_parser (.is (Parser Code)
+                              (|> methods
+                                  (list#each (method->parser class_vars fully_qualified_class_name))
+                                  (list#mix <>.either (<>.failure ""))))]]
     (in (list (` ("jvm class"
                   (~ (declaration$ (jvm.declaration full_class_name class_vars)))
                   (~ (class$ super))
@@ -1271,8 +1271,8 @@
                    {.#None}
                    ("jvm object null")))))))
 
-(syntax: .public (check [class (..type^ (list))
-                         unchecked (<>.maybe <code>.any)])
+(syntax: .public (as [class (..type^ (list))
+                      unchecked (<>.maybe <code>.any)])
   (with_symbols [g!_ g!unchecked]
     (let [class_name (..reflection class)
           class_type (` (.Primitive (~ (code.text class_name))))
@@ -1283,14 +1283,14 @@
                           {.#None}))]
       (case unchecked
         {.#Some unchecked}
-        (in (list (` (is (~ check_type)
-                         (let [(~ g!unchecked) (~ unchecked)]
-                           (~ check_code))))))
+        (in (list (` (.is (~ check_type)
+                          (let [(~ g!unchecked) (~ unchecked)]
+                            (~ check_code))))))
 
         {.#None}
-        (in (list (` (is (-> (.Primitive "java.lang.Object") (~ check_type))
-                         (function ((~ g!_) (~ g!unchecked))
-                           (~ check_code))))))
+        (in (list (` (.is (-> (.Primitive "java.lang.Object") (~ check_type))
+                          (function ((~ g!_) (~ g!unchecked))
+                            (~ check_code))))))
         ))))
 
 (syntax: .public (synchronized [lock <code>.any
@@ -1340,18 +1340,18 @@
     (let [(open "[0]") commons]
       (do [! meta.monad]
         [arg_inputs (monad.each !
-                                (is (-> [Bit (Type Value)] (Meta [Bit Code]))
-                                    (function (_ [maybe? _])
-                                      (with_symbols [arg_name]
-                                        (in [maybe? arg_name]))))
+                                (.is (-> [Bit (Type Value)] (Meta [Bit Code]))
+                                     (function (_ [maybe? _])
+                                       (with_symbols [arg_name]
+                                         (in [maybe? arg_name]))))
                                 #import_member_args)
          .let [input_jvm_types (list#each product.right #import_member_args)
-               arg_types (list#each (is (-> [Bit (Type Value)] Code)
-                                        (function (_ [maybe? arg])
-                                          (let [arg_type (value_type (the #import_member_mode commons) arg)]
-                                            (if maybe?
-                                              (` (Maybe (~ arg_type)))
-                                              arg_type))))
+               arg_types (list#each (.is (-> [Bit (Type Value)] Code)
+                                         (function (_ [maybe? arg])
+                                           (let [arg_type (value_type (the #import_member_mode commons) arg)]
+                                             (if maybe?
+                                               (` (Maybe (~ arg_type)))
+                                               arg_type))))
                                     #import_member_args)]]
         (in [arg_inputs input_jvm_types arg_types])))
 
@@ -1399,28 +1399,28 @@
 (template [<input?> <name> <unbox/box> <special+>]
   [(def: (<name> mode [unboxed raw])
      (-> Primitive_Mode [(Type Value) Code] Code)
-     (let [[unboxed refined post] (is [(Type Value) Code (List Code)]
-                                      (case mode
-                                        {#ManualPrM}
-                                        [unboxed raw (list)]
-                                        
-                                        {#AutoPrM}
-                                        (with_expansions [<special+>' (template.spliced <special+>)
-                                                          <cond_cases> (template [<primitive> <pre> <post>]
-                                                                         [(# jvm.equivalence = <primitive> unboxed)
-                                                                          (with_expansions [<post>' (template.spliced <post>)]
-                                                                            [<primitive>
-                                                                             (` (.|> (~ raw) (~+ <pre>)))
-                                                                             (list <post>')])]
-
-                                                                         <special+>')]
-                                          (cond <cond_cases>
-                                                ... else
-                                                [unboxed
-                                                 (if <input?>
-                                                   (` ("jvm object cast" (~ raw)))
-                                                   raw)
-                                                 (list)]))))
+     (let [[unboxed refined post] (.is [(Type Value) Code (List Code)]
+                                       (case mode
+                                         {#ManualPrM}
+                                         [unboxed raw (list)]
+                                         
+                                         {#AutoPrM}
+                                         (with_expansions [<special+>' (template.spliced <special+>)
+                                                           <cond_cases> (template [<primitive> <pre> <post>]
+                                                                          [(# jvm.equivalence = <primitive> unboxed)
+                                                                           (with_expansions [<post>' (template.spliced <post>)]
+                                                                             [<primitive>
+                                                                              (` (.|> (~ raw) (~+ <pre>)))
+                                                                              (list <post>')])]
+
+                                                                          <special+>')]
+                                           (cond <cond_cases>
+                                                 ... else
+                                                 [unboxed
+                                                  (if <input?>
+                                                    (` ("jvm object cast" (~ raw)))
+                                                    raw)
+                                                  (list)]))))
            unboxed/boxed (case (dictionary.value unboxed ..boxes)
                            {.#Some boxed}
                            (<unbox/box> unboxed boxed refined)
@@ -1464,8 +1464,8 @@
       (list.zipped/2 classes)
       (list#each (function (_ [class [maybe? input]])
                    (|> (if maybe?
-                         (` (is (.Primitive (~ (code.text (..reflection class))))
-                                ((~! !!!) (~ (..un_quoted input)))))
+                         (` (.is (.Primitive (~ (code.text (..reflection class))))
+                                 ((~! !!!) (~ (..un_quoted input)))))
                          (..un_quoted input))
                        [class]
                        (with_automatic_input_conversion mode))))))
@@ -1489,21 +1489,21 @@
       {#EnumDecl enum_members}
       (with_symbols [g!_]
         (do meta.monad
-          [.let [enum_type (is Code
-                               (case class_tvars
-                                 {.#End}
-                                 (` (.Primitive (~ (code.text full_name))))
-
-                                 _
-                                 (let [=class_tvars (list#each ..var$' class_tvars)]
-                                   (` (All ((~ g!_) (~+ =class_tvars))
-                                        (.Primitive (~ (code.text full_name)) [(~+ =class_tvars)]))))))
-                 getter_interop (is (-> Text Code)
-                                    (function (_ name)
-                                      (let [getter_name (code.symbol ["" (..import_name import_format method_prefix name)])]
-                                        (` (def: (~ getter_name)
-                                             (~ enum_type)
-                                             (~ (get_static_field full_name name)))))))]]
+          [.let [enum_type (.is Code
+                                (case class_tvars
+                                  {.#End}
+                                  (` (.Primitive (~ (code.text full_name))))
+
+                                  _
+                                  (let [=class_tvars (list#each ..var$' class_tvars)]
+                                    (` (All ((~ g!_) (~+ =class_tvars))
+                                         (.Primitive (~ (code.text full_name)) [(~+ =class_tvars)]))))))
+                 getter_interop (.is (-> Text Code)
+                                     (function (_ name)
+                                       (let [getter_name (code.symbol ["" (..import_name import_format method_prefix name)])]
+                                         (` (def: (~ getter_name)
+                                              (~ enum_type)
+                                              (~ (get_static_field full_name name)))))))]]
           (in (list#each getter_interop enum_members))))
       
       {#ConstructorDecl [commons _]}
@@ -1531,51 +1531,51 @@
           [.let [def_name (code.symbol ["" (..import_name import_format method_prefix (the #import_member_alias commons))])
                  (open "[0]") commons
                  (open "[0]") method
-                 [jvm_op object_ast] (is [Text (List Code)]
-                                         (case #import_member_kind
-                                           {#StaticIMK}
-                                           ["jvm member invoke static"
-                                            (list)]
-
-                                           {#VirtualIMK}
-                                           (case kind
-                                             {#Class}
-                                             ["jvm member invoke virtual"
-                                              (list g!obj)]
-                                             
-                                             {#Interface}
-                                             ["jvm member invoke interface"
-                                              (list g!obj)]
-                                             )))
+                 [jvm_op object_ast] (.is [Text (List Code)]
+                                          (case #import_member_kind
+                                            {#StaticIMK}
+                                            ["jvm member invoke static"
+                                             (list)]
+
+                                            {#VirtualIMK}
+                                            (case kind
+                                              {#Class}
+                                              ["jvm member invoke virtual"
+                                               (list g!obj)]
+                                              
+                                              {#Interface}
+                                              ["jvm member invoke interface"
+                                               (list g!obj)]
+                                              )))
                  method_return (the #import_method_return method)
-                 callC (is Code
-                           (` ((~ (code.text jvm_op))
-                               [(~+ (list#each ..var$ class_tvars))]
-                               (~ (code.text full_name))
-                               (~ (code.text #import_method_name))
-                               [(~+ (list#each ..var$ (the #import_member_tvars commons)))]
-                               (~+ (|> object_ast
-                                       (list#each ..un_quoted)
-                                       (list.zipped/2 (list (jvm.class full_name (list))))
-                                       (list#each (with_automatic_input_conversion (the #import_member_mode commons)))))
-                               (~+ (|> (jvm_invoke_inputs (the #import_member_mode commons) input_jvm_types arg_function_inputs)
-                                       (list.zipped/2 input_jvm_types)
-                                       (list#each ..decorate_input))))))
-                 jvm_interop (is Code
-                                 (case (jvm.void? method_return)
-                                   {.#Left method_return}
-                                   (|> [method_return
-                                        callC]
-                                       (with_automatic_output_conversion (the #import_member_mode commons))
-                                       (with_return_maybe member false method_return)
-                                       (with_return_try member)
-                                       (with_return_io member))
-                                   
-                                   
-                                   {.#Right method_return}
-                                   (|> callC
-                                       (with_return_try member)
-                                       (with_return_io member))))]]
+                 callC (.is Code
+                            (` ((~ (code.text jvm_op))
+                                [(~+ (list#each ..var$ class_tvars))]
+                                (~ (code.text full_name))
+                                (~ (code.text #import_method_name))
+                                [(~+ (list#each ..var$ (the #import_member_tvars commons)))]
+                                (~+ (|> object_ast
+                                        (list#each ..un_quoted)
+                                        (list.zipped/2 (list (jvm.class full_name (list))))
+                                        (list#each (with_automatic_input_conversion (the #import_member_mode commons)))))
+                                (~+ (|> (jvm_invoke_inputs (the #import_member_mode commons) input_jvm_types arg_function_inputs)
+                                        (list.zipped/2 input_jvm_types)
+                                        (list#each ..decorate_input))))))
+                 jvm_interop (.is Code
+                                  (case (jvm.void? method_return)
+                                    {.#Left method_return}
+                                    (|> [method_return
+                                         callC]
+                                        (with_automatic_output_conversion (the #import_member_mode commons))
+                                        (with_return_maybe member false method_return)
+                                        (with_return_try member)
+                                        (with_return_io member))
+                                    
+                                    
+                                    {.#Right method_return}
+                                    (|> callC
+                                        (with_return_try member)
+                                        (with_return_io member))))]]
           (in (list (` ((~! syntax:) ((~ def_name) [(~+ (syntax_inputs (list#each product.right arg_function_inputs)))
                                                     (~+ (syntax_inputs object_ast))])
                         ((~' in) (.list (.` (~ jvm_interop))))))))))
@@ -1602,27 +1602,27 @@
                                               getter_body)]
                             (in (` ((~! syntax:) (~ getter_call)
                                     ((~' in) (.list (.` (~ getter_body)))))))))
-         setter_interop (is (Meta (List Code))
-                            (if _#import_field_setter?
-                              (with_symbols [g!obj g!value]
-                                (let [setter_call (if _#import_field_static?
-                                                    (` ((~ setter_name) [(~ g!value) (~! <code>.any)]))
-                                                    (` ((~ setter_name) [(~ g!value) (~! <code>.any)
-                                                                         (~ g!obj) (~! <code>.any)])))
-                                      setter_value (|> [_#import_field_type (..un_quoted g!value)]
-                                                       (with_automatic_input_conversion _#import_field_mode))
-                                      setter_value (if _#import_field_maybe?
-                                                     (` ((~! !!!) (~ setter_value)))
-                                                     setter_value)
-                                      setter_command (format (if _#import_field_static? "jvm putstatic" "jvm putfield")
-                                                             ":" full_name ":" _#import_field_name)
-                                      g!obj+ (is (List Code)
-                                                 (if _#import_field_static?
-                                                   (list)
-                                                   (list (..un_quoted g!obj))))]
-                                  (in (list (` ((~! syntax:) (~ setter_call)
-                                                ((~' in) (.list (.` ((~! io.io) ((~ (code.text setter_command)) (~+ g!obj+) (~ setter_value))))))))))))
-                              (in (list))))]
+         setter_interop (.is (Meta (List Code))
+                             (if _#import_field_setter?
+                               (with_symbols [g!obj g!value]
+                                 (let [setter_call (if _#import_field_static?
+                                                     (` ((~ setter_name) [(~ g!value) (~! <code>.any)]))
+                                                     (` ((~ setter_name) [(~ g!value) (~! <code>.any)
+                                                                          (~ g!obj) (~! <code>.any)])))
+                                       setter_value (|> [_#import_field_type (..un_quoted g!value)]
+                                                        (with_automatic_input_conversion _#import_field_mode))
+                                       setter_value (if _#import_field_maybe?
+                                                      (` ((~! !!!) (~ setter_value)))
+                                                      setter_value)
+                                       setter_command (format (if _#import_field_static? "jvm putstatic" "jvm putfield")
+                                                              ":" full_name ":" _#import_field_name)
+                                       g!obj+ (.is (List Code)
+                                                   (if _#import_field_static?
+                                                     (list)
+                                                     (list (..un_quoted g!obj))))]
+                                   (in (list (` ((~! syntax:) (~ setter_call)
+                                                 ((~' in) (.list (.` ((~! io.io) ((~ (code.text setter_command)) (~+ g!obj+) (~ setter_value))))))))))))
+                               (in (list))))]
         (in (list& getter_interop setter_interop)))
       )))
 
@@ -1638,7 +1638,7 @@
   (All (_ a) (-> (.Primitive "java.lang.Class" [a]) Bit))
   (|>> ("jvm member invoke virtual" [] "java.lang.Class" "isInterface" [])
        "jvm object cast"
-       (is ..Boolean)
+       (.is ..Boolean)
        (.as Bit)))
 
 (def: load_class
@@ -1691,8 +1691,8 @@
                     [jvm.double  "jvm array new double"]
                     [jvm.char    "jvm array new char"]))
               ... else
-              (in (list (` (is (~ (value_type {#ManualPrM} (jvm.array type)))
-                               ("jvm array new object" (~ g!size))))))))))
+              (in (list (` (.is (~ (value_type {#ManualPrM} (jvm.array type)))
+                                ("jvm array new object" (~ g!size))))))))))
 
 (exception: .public (cannot_convert_to_jvm_type [type .Type])
   (exception.report
@@ -1762,18 +1762,18 @@
 
                   ... else
                   (# meta.monad each (jvm.class name)
-                     (is (Meta (List (Type Parameter)))
-                         (monad.each meta.monad
-                                     (function (_ paramLT)
-                                       (do meta.monad
-                                         [paramJT (lux_type->jvm_type context paramLT)]
-                                         (case (parser.parameter? paramJT)
-                                           {.#Some paramJT}
-                                           (in paramJT)
-
-                                           {.#None}
-                                           <failure>)))
-                                     params)))))
+                     (.is (Meta (List (Type Parameter)))
+                          (monad.each meta.monad
+                                      (function (_ paramLT)
+                                        (do meta.monad
+                                          [paramJT (lux_type->jvm_type context paramLT)]
+                                          (case (parser.parameter? paramJT)
+                                            {.#Some paramJT}
+                                            (in paramJT)
+
+                                            {.#None}
+                                            <failure>)))
+                                      params)))))
 
         {.#Apply A F}
         (case (type.applied (list A) F)
@@ -1921,7 +1921,7 @@
    "Signature" (..signature type)
    "Reflection" (..reflection type)))
 
-(syntax: .public (as [type (..type^ (list))
+(syntax: .public (is [type (..type^ (list))
                       object <code>.any])
   (case [(parser.array? type)
          (parser.class? type)]
@@ -1934,10 +1934,10 @@
 
 (template [<forward> <from> <to> <backward>]
   [(template: .public (<forward> it)
-     [(|> it (is <from>) (as <to>))])
+     [(|> it (.is <from>) (.as <to>))])
 
    (template: .public (<backward> it)
-     [(|> it (is <to>) (as <from>))])]
+     [(|> it (.is <to>) (.as <from>))])]
 
   [as_boolean .Bit ..Boolean of_boolean]
   [as_long .Int ..Long of_long]
@@ -1947,10 +1947,10 @@
 
 (template [<forward> <from> <$> <mid> <$'> <to> <backward>]
   [(template: .public (<forward> it)
-     [(|> it (is <from>) (as <mid>) <$> (is <to>))])
+     [(|> it (.is <from>) (.as <mid>) <$> (.is <to>))])
 
    (template: .public (<backward> it)
-     [(|> it (is <to>) <$'> (is <mid>) (as <from>))])]
+     [(|> it (.is <to>) <$'> (.is <mid>) (.as <from>))])]
 
   [as_byte .Int ..long_to_byte ..Long ..byte_to_long ..Byte of_byte]
   [as_short .Int ..long_to_short ..Long ..short_to_long ..Short of_short]
diff --git a/stdlib/source/library/lux/ffi.old.lux b/stdlib/source/library/lux/ffi.old.lux
index f6822f72a..0479558f9 100644
--- a/stdlib/source/library/lux/ffi.old.lux
+++ b/stdlib/source/library/lux/ffi.old.lux
@@ -1,6 +1,6 @@
 (.using
  [library
-  [lux {"-" as type}
+  [lux {"-" is as type}
    ["[0]" type ("[1]#[0]" equivalence)]
    [abstract
     ["[0]" monad {"+" Monad do}]
@@ -65,10 +65,10 @@
 
 (template [<forward> <from> <to> <backward>]
   [(template: .public (<forward> it)
-     [(|> it (is <from>) (.as (Primitive <to>)))])
+     [(|> it (.is <from>) (.as (Primitive <to>)))])
 
    (template: .public (<backward> it)
-     [(|> it (is (Primitive <to>)) (.as <from>))])]
+     [(|> it (.is (Primitive <to>)) (.as <from>))])]
 
   [as_boolean .Bit "java.lang.Boolean" of_boolean]
   [as_long .Int "java.lang.Long" of_long]
@@ -78,10 +78,10 @@
 
 (template [<forward> <from> <$> <mid> <$'> <to> <backward>]
   [(template: .public (<forward> it)
-     [(|> it (is <from>) (.as (Primitive <mid>)) <$> (is (Primitive <to>)))])
+     [(|> it (.is <from>) (.as (Primitive <mid>)) <$> (.is (Primitive <to>)))])
 
    (template: .public (<backward> it)
-     [(|> it (is (Primitive <to>)) <$'> (is (Primitive <mid>)) (.as <from>))])]
+     [(|> it (.is (Primitive <to>)) <$'> (.is (Primitive <mid>)) (.as <from>))])]
 
   [as_byte .Int ..long_to_byte "java.lang.Long" ..byte_to_long "java.lang.Byte" of_byte]
   [as_short .Int ..long_to_short "java.lang.Long" ..short_to_long "java.lang.Short" of_short]
@@ -380,14 +380,14 @@
 
 (def: (class_decl_type$ (open "[0]"))
   (-> Class_Declaration Code)
-  (let [=params (list#each (is (-> Type_Parameter Code)
-                               (function (_ [pname pbounds])
-                                 (case pbounds
-                                   {.#End}
-                                   (code.symbol ["" pname])
-
-                                   {.#Item bound1 _}
-                                   (class_type {#ManualPrM} #class_params bound1))))
+  (let [=params (list#each (.is (-> Type_Parameter Code)
+                                (function (_ [pname pbounds])
+                                  (case pbounds
+                                    {.#End}
+                                    (code.symbol ["" pname])
+
+                                    {.#Item bound1 _}
+                                    (class_type {#ManualPrM} #class_params bound1))))
                            #class_params)]
     (` (Primitive (~ (code.text (safe #class_name)))
                   [(~+ =params)]))))
@@ -457,8 +457,8 @@
   (-> Text Text (Parser Code))
   (do <>.monad
     [.let [dotted_name (format "::" field_name)]
-     [_ _ value] (is (Parser [Any Any Code])
-                     (<code>.form ($_ <>.and (<code>.this (' :=)) (<code>.this (code.symbol ["" dotted_name])) <code>.any)))]
+     [_ _ value] (.is (Parser [Any Any Code])
+                      (<code>.form ($_ <>.and (<code>.this (' :=)) (<code>.this (code.symbol ["" dotted_name])) <code>.any)))]
     (in (`' ((~ (code.text (format "jvm putfield" ":" class_name ":" field_name))) _jvm_this (~ value))))))
 
 (def: (pre_walk_replace f input)
@@ -497,10 +497,10 @@
 (def: (constructor_parser params class_name arg_decls)
   (-> (List Type_Parameter) Text (List ArgDecl) (Parser Code))
   (do <>.monad
-    [args (is (Parser (List Code))
-              (<code>.form (<>.after (<code>.this (' ::new!))
-                                     (<code>.tuple (<>.exactly (list.size arg_decls) <code>.any)))))
-     .let [arg_decls' (is (List Text) (list#each (|>> product.right (simple_class$ params)) arg_decls))]]
+    [args (.is (Parser (List Code))
+               (<code>.form (<>.after (<code>.this (' ::new!))
+                                      (<code>.tuple (<>.exactly (list.size arg_decls) <code>.any)))))
+     .let [arg_decls' (.is (List Text) (list#each (|>> product.right (simple_class$ params)) arg_decls))]]
     (in (` ((~ (code.text (format "jvm new" ":" class_name ":" (text.interposed "," arg_decls'))))
             (~+ args))))))
 
@@ -508,10 +508,10 @@
   (-> (List Type_Parameter) Text Text (List ArgDecl) (Parser Code))
   (do <>.monad
     [.let [dotted_name (format "::" method_name "!")]
-     args (is (Parser (List Code))
-              (<code>.form (<>.after (<code>.this (code.symbol ["" dotted_name]))
-                                     (<code>.tuple (<>.exactly (list.size arg_decls) <code>.any)))))
-     .let [arg_decls' (is (List Text) (list#each (|>> product.right (simple_class$ params)) arg_decls))]]
+     args (.is (Parser (List Code))
+               (<code>.form (<>.after (<code>.this (code.symbol ["" dotted_name]))
+                                      (<code>.tuple (<>.exactly (list.size arg_decls) <code>.any)))))
+     .let [arg_decls' (.is (List Text) (list#each (|>> product.right (simple_class$ params)) arg_decls))]]
     (in (`' ((~ (code.text (format "jvm invokestatic" ":" class_name ":" method_name ":" (text.interposed "," arg_decls'))))
              (~+ args))))))
 
@@ -520,10 +520,10 @@
      (-> (List Type_Parameter) Text Text (List ArgDecl) (Parser Code))
      (do <>.monad
        [.let [dotted_name (format "::" method_name "!")]
-        args (is (Parser (List Code))
-                 (<code>.form (<>.after (<code>.this (code.symbol ["" dotted_name]))
-                                        (<code>.tuple (<>.exactly (list.size arg_decls) <code>.any)))))
-        .let [arg_decls' (is (List Text) (list#each (|>> product.right (simple_class$ params)) arg_decls))]]
+        args (.is (Parser (List Code))
+                  (<code>.form (<>.after (<code>.this (code.symbol ["" dotted_name]))
+                                         (<code>.tuple (<>.exactly (list.size arg_decls) <code>.any)))))
+        .let [arg_decls' (.is (List Text) (list#each (|>> product.right (simple_class$ params)) arg_decls))]]
        (in (`' ((~ (code.text (format <jvm_op> ":" class_name ":" method_name ":" (text.interposed "," arg_decls'))))
                 (~' _jvm_this) (~+ args))))))]
 
@@ -933,9 +933,9 @@
                                              #import_member_io?     io?]
                                             []]})))
       (<code>.form (do <>.monad
-                     [kind (is (Parser ImportMethodKind)
-                               (<>.or (<code>.this (' "static"))
-                                      (in [])))
+                     [kind (.is (Parser ImportMethodKind)
+                                (<>.or (<code>.this (' "static"))
+                                       (in [])))
                       tvars ..type_params^
                       name <code>.local
                       ?alias import_member_alias^
@@ -1128,8 +1128,8 @@
     (let [super_replacer (parser_replacer (<code>.form (do <>.monad
                                                          [_ (<code>.this (' ::super!))
                                                           args (<code>.tuple (<>.exactly (list.size arg_decls) <code>.any))
-                                                          .let [arg_decls' (is (List Text) (list#each (|>> product.right (simple_class$ (list)))
-                                                                                                      arg_decls))]]
+                                                          .let [arg_decls' (.is (List Text) (list#each (|>> product.right (simple_class$ (list)))
+                                                                                                       arg_decls))]]
                                                          (in (`' ((~ (code.text (format "jvm invokespecial"
                                                                                         ":" (the #super_class_name super_class)
                                                                                         ":" name
@@ -1277,8 +1277,8 @@
                    {.#None}
                    ("jvm object null")))))))
 
-(syntax: .public (check [class (..generic_type^ (list))
-                         unchecked (<>.maybe <code>.any)])
+(syntax: .public (as [class (..generic_type^ (list))
+                      unchecked (<>.maybe <code>.any)])
   (with_symbols [g!_ g!unchecked]
     (let [class_name (simple_class$ (list) class)
           class_type (` (.Primitive (~ (code.text class_name))))
@@ -1289,14 +1289,14 @@
                           {.#None}))]
       (case unchecked
         {.#Some unchecked}
-        (in (list (` (is (~ check_type)
-                         (let [(~ g!unchecked) (~ unchecked)]
-                           (~ check_code))))))
+        (in (list (` (.is (~ check_type)
+                          (let [(~ g!unchecked) (~ unchecked)]
+                            (~ check_code))))))
 
         {.#None}
-        (in (list (` (is (-> (Primitive "java.lang.Object") (~ check_type))
-                         (function ((~ g!_) (~ g!unchecked))
-                           (~ check_code))))))
+        (in (list (` (.is (-> (Primitive "java.lang.Object") (~ check_type))
+                          (function ((~ g!_) (~ g!unchecked))
+                            (~ check_code))))))
         ))))
 
 (syntax: .public (synchronized [lock <code>.any
@@ -1344,20 +1344,20 @@
     (let [(open "[0]") commons]
       (do [! meta.monad]
         [arg_inputs (monad.each !
-                                (is (-> [Bit GenericType] (Meta [Bit Code]))
-                                    (function (_ [maybe? _])
-                                      (with_symbols [arg_name]
-                                        (in [maybe? arg_name]))))
+                                (.is (-> [Bit GenericType] (Meta [Bit Code]))
+                                     (function (_ [maybe? _])
+                                       (with_symbols [arg_name]
+                                         (in [maybe? arg_name]))))
                                 #import_member_args)
-         .let [arg_classes (is (List Text)
-                               (list#each (|>> product.right (simple_class$ (list#composite type_params #import_member_tvars)))
-                                          #import_member_args))
-               arg_types (list#each (is (-> [Bit GenericType] Code)
-                                        (function (_ [maybe? arg])
-                                          (let [arg_type (class_type (the #import_member_mode commons) type_params arg)]
-                                            (if maybe?
-                                              (` (Maybe (~ arg_type)))
-                                              arg_type))))
+         .let [arg_classes (.is (List Text)
+                                (list#each (|>> product.right (simple_class$ (list#composite type_params #import_member_tvars)))
+                                           #import_member_args))
+               arg_types (list#each (.is (-> [Bit GenericType] Code)
+                                         (function (_ [maybe? arg])
+                                           (let [arg_type (class_type (the #import_member_mode commons) type_params arg)]
+                                             (if maybe?
+                                               (` (Maybe (~ arg_type)))
+                                               arg_type))))
                                     #import_member_args)]]
         (in [arg_inputs arg_classes arg_types])))
 
@@ -1459,22 +1459,22 @@
       {#EnumDecl enum_members}
       (macro.with_symbols [g!_]
         (do [! meta.monad]
-          [.let [enum_type (is Code
-                               (case class_tvars
-                                 {.#End}
-                                 (` (Primitive (~ (code.text full_name))))
-
-                                 _
-                                 (let [=class_tvars (|> class_tvars
-                                                        (list.only free_type_param?)
-                                                        (list#each lux_type_parameter))]
-                                   (` (All ((~ g!_) (~+ =class_tvars)) (Primitive (~ (code.text full_name)) [(~+ =class_tvars)]))))))
-                 getter_interop (is (-> Text Code)
-                                    (function (_ name)
-                                      (let [getter_name (code.symbol ["" (..import_name import_format method_prefix name)])]
-                                        (` (def: (~ getter_name)
-                                             (~ enum_type)
-                                             ((~ (code.text (format "jvm getstatic" ":" full_name ":" name)))))))))]]
+          [.let [enum_type (.is Code
+                                (case class_tvars
+                                  {.#End}
+                                  (` (Primitive (~ (code.text full_name))))
+
+                                  _
+                                  (let [=class_tvars (|> class_tvars
+                                                         (list.only free_type_param?)
+                                                         (list#each lux_type_parameter))]
+                                    (` (All ((~ g!_) (~+ =class_tvars)) (Primitive (~ (code.text full_name)) [(~+ =class_tvars)]))))))
+                 getter_interop (.is (-> Text Code)
+                                     (function (_ name)
+                                       (let [getter_name (code.symbol ["" (..import_name import_format method_prefix name)])]
+                                         (` (def: (~ getter_name)
+                                              (~ enum_type)
+                                              ((~ (code.text (format "jvm getstatic" ":" full_name ":" name)))))))))]]
           (in (list#each getter_interop enum_members))))
       
       {#ConstructorDecl [commons _]}
@@ -1495,22 +1495,22 @@
           [.let [def_name (code.symbol ["" (..import_name import_format method_prefix (the #import_member_alias commons))])
                  (open "[0]") commons
                  (open "[0]") method
-                 [jvm_op object_ast] (is [Text (List Code)]
-                                         (case #import_member_kind
-                                           {#StaticIMK}
-                                           ["invokestatic"
-                                            (list)]
-
-                                           {#VirtualIMK}
-                                           (case kind
-                                             {#Class}
-                                             ["invokevirtual"
-                                              (list g!obj)]
-                                             
-                                             {#Interface}
-                                             ["invokeinterface"
-                                              (list g!obj)]
-                                             )))
+                 [jvm_op object_ast] (.is [Text (List Code)]
+                                          (case #import_member_kind
+                                            {#StaticIMK}
+                                            ["invokestatic"
+                                             (list)]
+
+                                            {#VirtualIMK}
+                                            (case kind
+                                              {#Class}
+                                              ["invokevirtual"
+                                               (list g!obj)]
+                                              
+                                              {#Interface}
+                                              ["invokeinterface"
+                                               (list g!obj)]
+                                              )))
                  jvm_extension (code.text (format "jvm " jvm_op ":" full_name ":" #import_method_name ":" (text.interposed "," arg_classes)))
                  jvm_interop (|> [(simple_class$ (list) (the #import_method_return method))
                                   (` ((~ jvm_extension) (~+ (list#each un_quote object_ast))
@@ -1531,10 +1531,10 @@
                typeC (if #import_field_maybe?
                        (` (Maybe (~ base_gtype)))
                        base_gtype)
-               tvar_asts (is (List Code)
-                             (|> class_tvars
-                                 (list.only free_type_param?)
-                                 (list#each lux_type_parameter)))
+               tvar_asts (.is (List Code)
+                              (|> class_tvars
+                                  (list.only free_type_param?)
+                                  (list#each lux_type_parameter)))
                getter_name (code.symbol ["" (..import_name import_format method_prefix #import_field_name)])
                setter_name (code.symbol ["" (..import_name import_format method_prefix (format #import_field_name "!"))])]
          getter_interop (with_symbols [g!obj]
@@ -1556,27 +1556,27 @@
                                               getter_body)]
                             (in (` ((~! syntax:) (~ getter_call)
                                     ((~' in) (.list (.` (~ getter_body)))))))))
-         setter_interop (is (Meta (List Code))
-                            (if #import_field_setter?
-                              (with_symbols [g!obj g!value]
-                                (let [setter_call (if #import_field_static?
-                                                    (` ((~ setter_name) [(~ g!value) (~! <code>.any)]))
-                                                    (` ((~ setter_name) [(~ g!value) (~! <code>.any)
-                                                                         (~ g!obj) (~! <code>.any)])))
-                                      setter_value (auto_convert_input #import_field_mode
-                                                                       [(simple_class$ (list) #import_field_type) (un_quote g!value)])
-                                      setter_value (if #import_field_maybe?
-                                                     (` ((~! !!!) (~ setter_value)))
-                                                     setter_value)
-                                      setter_command (format (if #import_field_static? "jvm putstatic" "jvm putfield")
-                                                             ":" full_name ":" #import_field_name)
-                                      g!obj+ (is (List Code)
-                                                 (if #import_field_static?
-                                                   (list)
-                                                   (list (un_quote g!obj))))]
-                                  (in (list (` ((~! syntax:) (~ setter_call)
-                                                ((~' in) (.list (.` ((~! io.io) ((~ (code.text setter_command)) (~+ g!obj+) (~ setter_value))))))))))))
-                              (in (list))))]
+         setter_interop (.is (Meta (List Code))
+                             (if #import_field_setter?
+                               (with_symbols [g!obj g!value]
+                                 (let [setter_call (if #import_field_static?
+                                                     (` ((~ setter_name) [(~ g!value) (~! <code>.any)]))
+                                                     (` ((~ setter_name) [(~ g!value) (~! <code>.any)
+                                                                          (~ g!obj) (~! <code>.any)])))
+                                       setter_value (auto_convert_input #import_field_mode
+                                                                        [(simple_class$ (list) #import_field_type) (un_quote g!value)])
+                                       setter_value (if #import_field_maybe?
+                                                      (` ((~! !!!) (~ setter_value)))
+                                                      setter_value)
+                                       setter_command (format (if #import_field_static? "jvm putstatic" "jvm putfield")
+                                                              ":" full_name ":" #import_field_name)
+                                       g!obj+ (.is (List Code)
+                                                   (if #import_field_static?
+                                                     (list)
+                                                     (list (un_quote g!obj))))]
+                                   (in (list (` ((~! syntax:) (~ setter_call)
+                                                 ((~' in) (.list (.` ((~! io.io) ((~ (code.text setter_command)) (~+ g!obj+) (~ setter_value))))))))))))
+                               (in (list))))]
         (in (list& getter_interop setter_interop)))
       )))
 
diff --git a/stdlib/source/library/lux/target/jvm/reflection.lux b/stdlib/source/library/lux/target/jvm/reflection.lux
index 94ca109a2..44c4bda89 100644
--- a/stdlib/source/library/lux/target/jvm/reflection.lux
+++ b/stdlib/source/library/lux/target/jvm/reflection.lux
@@ -130,7 +130,7 @@
   (-> (-> java/lang/reflect/Type (Try (/.Type Parameter)))
       java/lang/reflect/Type
       (Try (/.Type Class)))
-  (<| (case (ffi.check java/lang/Class reflection)
+  (<| (case (ffi.as java/lang/Class reflection)
         {.#Some class}
         (let [class_name (|> class
                              (as (java/lang/Class java/lang/Object))
@@ -151,10 +151,10 @@
                 (exception.except ..not_a_class [reflection])
                 {try.#Success (/.class class_name (list))})))
         _)
-      (case (ffi.check java/lang/reflect/ParameterizedType reflection)
+      (case (ffi.as java/lang/reflect/ParameterizedType reflection)
         {.#Some reflection}
         (let [raw (java/lang/reflect/ParameterizedType::getRawType reflection)]
-          (case (ffi.check java/lang/Class raw)
+          (case (ffi.as java/lang/Class raw)
             {.#Some raw'}
             (let [! try.monad]
               (|> reflection
@@ -175,11 +175,11 @@
 (def: .public (parameter type reflection)
   (-> (-> java/lang/reflect/Type (Try (/.Type Value)))
       (-> java/lang/reflect/Type (Try (/.Type Parameter))))
-  (<| (case (ffi.check java/lang/reflect/TypeVariable reflection)
+  (<| (case (ffi.as java/lang/reflect/TypeVariable reflection)
         {.#Some reflection}
         {try.#Success (/.var (java/lang/reflect/TypeVariable::getName reflection))}
         _)
-      (case (ffi.check java/lang/reflect/WildcardType reflection)
+      (case (ffi.as java/lang/reflect/WildcardType reflection)
         {.#Some reflection}
         ... TODO: Instead of having single lower/upper bounds, should
         ... allow for multiple ones.
@@ -187,7 +187,7 @@
                (array.read! 0 (java/lang/reflect/WildcardType::getUpperBounds reflection))]
           (^.template [<pattern> <kind>]
             [<pattern>
-             (case (ffi.check java/lang/reflect/GenericArrayType bound)
+             (case (ffi.as java/lang/reflect/GenericArrayType bound)
                {.#Some it}
                ... TODO: Array bounds should not be "erased" as they
                ... are right now.
@@ -201,14 +201,14 @@
           _
           {try.#Success /.wildcard})
         _)
-      (case (ffi.check java/lang/reflect/GenericArrayType reflection)
+      (case (ffi.as java/lang/reflect/GenericArrayType reflection)
         {.#Some reflection}
         (|> reflection
             java/lang/reflect/GenericArrayType::getGenericComponentType
             type
             (# try.monad each /.array))
         _)
-      (case (ffi.check java/lang/Class reflection)
+      (case (ffi.as java/lang/Class reflection)
         {.#Some class}
         (if (java/lang/Class::isArray class)
           (|> class
@@ -221,7 +221,7 @@
 
 (def: .public (type reflection)
   (-> java/lang/reflect/Type (Try (/.Type Value)))
-  (<| (case (ffi.check java/lang/Class reflection)
+  (<| (case (ffi.as java/lang/Class reflection)
         {.#Some reflection}
         (let [class_name (|> reflection
                              (as (java/lang/Class java/lang/Object))
@@ -254,7 +254,7 @@
 (def: .public (return reflection)
   (-> java/lang/reflect/Type (Try (/.Type Return)))
   (with_expansions [<else> (these (..type reflection))]
-    (case (ffi.check java/lang/Class reflection)
+    (case (ffi.as java/lang/Class reflection)
       {.#Some class}
       (let [class_name (|> reflection
                            (as (java/lang/Class java/lang/Object))
@@ -362,7 +362,7 @@
 (def: .public deprecated?
   (-> (array.Array java/lang/annotation/Annotation) Bit)
   (|>> (array.list {.#None})
-       (list.all (|>> (ffi.check java/lang/Deprecated)))
+       (list.all (|>> (ffi.as java/lang/Deprecated)))
        list.empty?
        not))
 
diff --git a/stdlib/source/test/lux/ffi.jvm.lux b/stdlib/source/test/lux/ffi.jvm.lux
index abdc297c7..2db7c0bc3 100644
--- a/stdlib/source/test/lux/ffi.jvm.lux
+++ b/stdlib/source/test/lux/ffi.jvm.lux
@@ -165,11 +165,11 @@
 
          bit/0 random.bit]
         ($_ _.and
-            (_.cover [/.check]
-                     (and (case (/.check java/lang/String sample) {.#Some _} true {.#None} false)
-                          (case (/.check java/lang/Long sample) {.#Some _} false {.#None} true)
-                          (case (/.check java/lang/Object sample) {.#Some _} true {.#None} false)
-                          (case (/.check java/lang/Object (/.null)) {.#Some _} false {.#None} true)))
+            (_.cover [/.as]
+                     (and (case (/.as java/lang/String sample) {.#Some _} true {.#None} false)
+                          (case (/.as java/lang/Long sample) {.#Some _} false {.#None} true)
+                          (case (/.as java/lang/Object sample) {.#Some _} true {.#None} false)
+                          (case (/.as java/lang/Object (/.null)) {.#Some _} false {.#None} true)))
             (_.cover [/.synchronized]
                      (/.synchronized sample #1))
             (_.cover [/.class_for]
@@ -237,10 +237,10 @@
                            (text#= it))))
             (_.cover [/.cannot_cast_to_non_object]
                      (text.contains? (the exception.#label /.cannot_cast_to_non_object)
-                                     (macro_error (/.as boolean (is /.Boolean boolean)))))
-            (_.cover [/.as]
+                                     (macro_error (/.is boolean (is /.Boolean boolean)))))
+            (_.cover [/.is]
                      (|> string
-                         (/.as java/lang/Object)
+                         (/.is java/lang/Object)
                          (same? (as java/lang/Object string))))
             (_.cover [/.type]
                      (and (and (type#= /.Boolean (/.type java/lang/Boolean))
diff --git a/stdlib/source/test/lux/ffi.old.lux b/stdlib/source/test/lux/ffi.old.lux
index f452cf5a1..2b50f700c 100644
--- a/stdlib/source/test/lux/ffi.old.lux
+++ b/stdlib/source/test/lux/ffi.old.lux
@@ -201,11 +201,11 @@
      counter random.int
      increase random.int]
     ($_ _.and
-        (_.cover [/.check]
-                 (and (case (/.check java/lang/String sample) {.#Some _} true {.#None} false)
-                      (case (/.check java/lang/Long sample) {.#Some _} false {.#None} true)
-                      (case (/.check java/lang/Object sample) {.#Some _} true {.#None} false)
-                      (case (/.check java/lang/Object (/.null)) {.#Some _} false {.#None} true)))
+        (_.cover [/.as]
+                 (and (case (/.as java/lang/String sample) {.#Some _} true {.#None} false)
+                      (case (/.as java/lang/Long sample) {.#Some _} false {.#None} true)
+                      (case (/.as java/lang/Object sample) {.#Some _} true {.#None} false)
+                      (case (/.as java/lang/Object (/.null)) {.#Some _} false {.#None} true)))
         (_.cover [/.synchronized]
                  (/.synchronized sample #1))
         (_.cover [/.class_for /.import:]
-- 
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